Child maltreatment recognition and response — branching viva

Opening question

Examiner: The registrar wants to send this infant home as a minor accidental bruise. Would you? Why? [8]

Candidate: No, I would not send the child home on that basis. This is a sentinel injury — a visible minor injury in a pre-mobile infant whose stated mechanism does not fit. A three-month-old who cannot yet roll cannot plausibly bruise the pinna and the cheek on a feed-bottle. Sentinel injuries are the most preventable miss in paediatrics: roughly one in three such infants has occult abuse found on workup, and the injury may precede a fatal event. I would document, examine fully, investigate, and report, in parallel. [8] [9]

Probe 1 — the bruising rule

Examiner: You mention a rule. Which one, and does it apply here? [7]

Candidate: The TEN-4-FBCP bruising clinical decision rule. It is positive for bruising of the Torso, Ear or Neck; any bruise in a child under four years; and Frenulum, suborbital (BandE) or Cheek bruising in an infant. This infant has an ear bruise and a cheek/suborbital bruise, so the rule is positive and carries a high likelihood of abuse. A positive rule means evaluate fully — not reassure. [7] [6]

Probe 2 — the workup

Examiner: Walk me through your investigations. [9]

Candidate: A skeletal survey with dedicated, multiple views of every bone — never a single babygram — repeated at 11 to 14 days to detect occult fractures and clarify callus dating. A coagulation screen to exclude a bleeding diathesis before I attribute the bruising. A top-to-toe examination documented on a body map with photographs. If I found any encephalopathy, I would add CT brain, MRI once stable, and specialist indirect ophthalmoscopy for retinal haemorrhages, with a metabolic workup to exclude mimics. [9] [12]

Probe 3 — the corner: the report

Examiner: The parents are respected professionals and the injury is tiny. Surely you would finish the tests before involving child protection? [2]

Candidate: No. The mandatory report rests on a reasonable belief that the child has suffered or is at risk of significant harm — not on diagnostic certainty, and not on the family's status. I have a rule-positive sentinel injury in a pre-mobile infant; that is a reasonable belief of risk. I report now, and the skeletal survey and the rest of the workup proceed in parallel. Waiting for certainty leaves the child exposed to re-injury, which after a sentinel event may be fatal. [2] [8]

Probe 4 — mechanism and prognosis

Examiner: The infant looks well. Why does a small injury carry lifelong cost? [3]

Candidate: Because the harm of maltreatment is not only the acute injury — it is the toxic-stress cascade. Maltreatment chronically activates the stress response beyond the tolerable range when there is no buffering adult, recalibrating the HPA axis, dysregulating immunity and altering brain architecture, in a dose-response relationship with adult disease. The intervention with the strongest evidence is preserving or rebuilding a stable, responsive adult relationship, which is why a safety plan and trauma-focused support matter as much as the medical workup. [3] [2]

Probe 5 — pitfalls

Examiner: Where could you go wrong here? [14]

Candidate: In both directions. I could miss the sentinel injury by reassuring a confident family, which is the most preventable failure. Or I could falsely accuse a family by mistaking a mimic for abuse — though a Mongolian spot is over the sacrum and unchanged, not on the ear and cheek. I could delay the report to await certainty. I could confound a bleeding disorder with abuse if I skip the coagulation screen. And I could re-traumatise the child by repeating examinations instead of coordinating a single examination by a trained clinician. [6] [14]